I leave my PW light level always at level 22 of 24. It works for me best that way in all ambient light levels during daylight. As evening approaches I use my KFHD7-32 with white on black settings. For totally dark settings like, if I wake up in the night to make a note on my KFHD7-32, I leave that unit's light level at a very low level to accommodate my eyes.
For total battery analysis I use GSam Battery Monitor on the KFHD7-32. There is no equivalent app for the PW so far as I know.
My PW lasts 11 to 13 days before the battery recharge indicator shows. My KFHD7-32 last 5 to 9 days.
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